Alert archive / Tennessee / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 117, NWS Morristown, TN

July 23, 2020Carter County, Sullivan County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jul 23, 2020, 3:09 PM EDT for Carter County, Sullivan County, Tennessee. It was in force for 36 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 23, 2020, 3:09 PM EDT (19:09 UTC)
Expired: Jul 23, 2020, 3:45 PM EDT
In force: 36 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Carter County, TN, Sullivan County, TN

The radar

The Knoxville radar (KMRX), 109 km from the middle of the area, began a volume at 19:12 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 7.2 hours before the alert went out and 211 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 829 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 1032 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -22 m²/s²
0-3 km storm-relative helicity: 11 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Morristown, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 23, 1:55 PM EDT, 1 hour 14 minutes earlier.

Area forecast discussion, Jul 23, 1:55 PM EDT, 1 hour 14 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Hazardous weather outlook, Jul 23, 3:34 AM EDT, 11 hours 35 minutes before

Hazardous Weather Outlook
National Weather Service Morristown TN
334 AM EDT Thu Jul 23 2020

NCZ060-061-TNZ012-013-035-036-067-068-081>087-098>102-240745-
Cherokee-Clay-Scott-Campbell-Morgan-Anderson-Roane-Loudon-
Sequatchie-Bledsoe-Rhea-Meigs-McMinn-Northwest Monroe-
Southeast Monroe-Marion-Hamilton-Bradley-West Polk-East Polk-
334 AM EDT Thu Jul 23 2020 /234 AM CDT Thu Jul 23 2020/

This Hazardous Weather Outlook is for portions of southwest North
Carolina and east Tennessee.

.DAY ONE...Today and Tonight

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not needed at this time.

TNZ014>018-037>047-069>074-VAZ001-002-005-006-008-240745-
Claiborne-Hancock-Hawkins-Sullivan-Johnson-Union-Grainger-Hamblen-
Northwest Cocke-Cocke Smoky Mountains-Northwest Greene-
Southeast Greene-Washington-Unicoi-Northwest Carter-
Southeast Carter-Knox-Jefferson-Northwest Blount-
Blount Smoky Mountains-North Sevier-Sevier Smoky Mountains-Lee-
Wise-Scott-Russell-
334 AM EDT Thu Jul 23 2020

This Hazardous Weather Outlook is for portions of east Tennessee
and southwest Virginia.

.DAY ONE...Today and Tonight

Scattered to numerous showers and thunderstorms are in the
forecast today. Moderate to heavy rainfall is possible at times
which could lead to localized flash flooding.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not needed at this time.

In the hours before

Special weather statement, Jul 23, 2:37 PM EDT, 32 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Special weather statement, Jul 23, 2:42 PM EDT, 27 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Special weather statement, Jul 23, 2:42 PM EDT, 27 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Special weather statement, Jul 23, 2:44 PM EDT, 25 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Special weather statement, Jul 23, 2:52 PM EDT, 17 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Special weather statement, Jul 23, 2:55 PM EDT, 14 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

Everything else NWS Morristown, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 22, 9:45 PM EDT	Areal Flood Advisory	MRX	Hawkins, Sullivan	2 hr
Jul 23, 12:23 PM EDT	Special Weather Statement	MRX	Hamblen	52 min
Jul 23, 12:34 PM EDT	Special Weather Statement	MRX	Rhea	26 min
Jul 23, 12:37 PM EDT	Severe Thunderstorm Warning	MRX	Hamilton, Meigs	38 min
Jul 23, 1:14 PM EDT	Areal Flood Advisory	MRX	Hamilton	3 hr
Jul 23, 1:28 PM EDT	Special Weather Statement	MRX	Morgan	47 min
Jul 23, 1:52 PM EDT	Areal Flood Advisory	MRX	Morgan	113 min
Jul 23, 2:00 PM EDT	Special Weather Statement	MRX	McMinn	30 min
Jul 23, 2:02 PM EDT	Special Weather Statement	MRX	Washington	43 min
Jul 23, 2:15 PM EDT	Special Weather Statement	MRX	Morgan, Scott	45 min
Jul 23, 2:37 PM EDT	Special Weather Statement	MRX	Carter	38 min
Jul 23, 2:42 PM EDT	Special Weather Statement	MRX	Roane	48 min
Jul 23, 2:44 PM EDT	Special Weather Statement	MRX	Carter	31 min
Jul 23, 2:52 PM EDT	Special Weather Statement	MRX	Knox	23 min
Jul 23, 2:55 PM EDT	Special Weather Statement	MRX	Loudon	35 min
Jul 23, 3:00 PM EDT	Areal Flood Advisory	MRX	Campbell, Morgan, Scott	2 hr
Jul 23, 3:16 PM EDT	Special Weather Statement	MRX	Blount	44 min
Jul 23, 3:25 PM EDT	Areal Flood Advisory	MRX	Carter	2 hr
Jul 23, 3:44 PM EDT	Special Weather Statement	MRX	Grainger	31 min
Jul 23, 3:59 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Jefferson, Sevier	46 min
Jul 23, 4:06 PM EDT	Special Weather Statement	MRX	Sevier	54 min
Jul 23, 4:07 PM EDT	Special Weather Statement	MRX	Hawkins	68 min
Jul 23, 4:12 PM EDT	Special Weather Statement	MRX	Greene	63 min
Jul 23, 4:20 PM EDT	Special Weather Statement	MRX	Greene	55 min
Jul 23, 4:21 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Greene	54 min
Jul 23, 4:32 PM EDT	Severe Thunderstorm Warning	MRX	Greene, Hancock, Hawkins	43 min
Jul 23, 4:41 PM EDT	Special Weather Statement	MRX	Cocke	49 min
Jul 23, 4:48 PM EDT	Special Weather Statement	MRX	Greene	57 min
Jul 23, 5:03 PM EDT	Severe Thunderstorm Warning	MRX	Greene, Hawkins, Sullivan, Washington	57 min
Jul 23, 5:22 PM EDT	Special Weather Statement	MRX	Monroe	53 min
Jul 23, 5:40 PM EDT	Special Weather Statement	MRX	Carter, Johnson, Sullivan	50 min
Jul 23, 5:46 PM EDT	Severe Thunderstorm Warning	MRX	Carter, Unicoi, Washington	44 min
Jul 23, 6:27 PM EDT	Special Weather Statement	MRX	Johnson	33 min
Jul 22, 9:36 PM EDT	Special Weather Statement	MRX	Scott	39 min
Jul 23, 3:29 PM EDT	Areal Flood Advisory	MRX	Russell	3 hr
Jul 23, 3:38 PM EDT	Special Weather Statement	MRX	Washington	37 min
Jul 23, 3:46 PM EDT	Special Weather Statement	MRX	Washington, City of Bristol	29 min
Jul 23, 4:37 PM EDT	Areal Flood Advisory	MRX	Washington, City of Bristol	3 hr

Nearby

Severe Thunderstorm Warnings in Tennessee, 2020 Every severe thunderstorm warning in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.